Calibrating the L2 WFR waveform data

Level-2 (L2) Waveform data is amplitude-calibrated at 1 kHz.
But there are amplitude deviations at other frequencies,
and there are phase shifts which are not reflected in the
L2 data at all. The phase shift is a frequency-dependent
shift in the phase of the observed wave relative to the input
wave, tantamount to a time delay at that frequency. 

The L2 data can be adjusted over frequency by applying
dimensionless complex factors over frequency immediately after
Fourier transforming the L2 data. The table, called
L2_fsw_tables_full_res_adjustment.txt, consists of a table
for the B sensors and a table for the E sensors. Each table
has 5600 complex entries, extending from 2.13623 to 11962.89 Hz,
in steps of 2.13623 Hz. Above the highest frequency the WFR filters
roll off; no calibration measurements exist, but one could apply
the last adjustment to any frequencies above that.

The table is constructed assuming 16384 data points were to be FFT'ed.
If fewer than that are to be transformed, then the table can be decimated
to accommodate a shorter data set. The procedure is to FFT the L2 data at
some resolution and then perform a complex multiplication of the FFT'ed data
and the E or B adjustment table.
 
If comparing results of the frequency-adjusted L2 data with the onboard
survey spectra, note that the L2 data has units of volts/meter and nanoTesla
for E and B respectively, whereas the onboard survey spectra have units of
RMS volts/meter and RMS nanoTesla.